Reducing the amount of updates we make to the assets slice should
improve performance and reduce blocking UI due to store updates.
The new prices slice indexes asset prices by asset ids, this way each
update is diffed and processed faster.

The now available isTrustedToken checks if assets meet these replaced
conditions, isTokenListAsset/isNetworkBaseAsset.

This should help reduce redundancy after trust checks

Removed symbols from network base asset ids generation, added chain id
to ids for all asset types. This allows us to use these for indexing
assets across networks in e.g. redux.

These were overlooked during the process of segregating prices from the assets slice